Injection molding device for inner gears with pouring gates cut in mold, and injection molding method

Abstract

The invention provides an injection molding device for inner gears with pouring gates cut in a mold, and an injection molding method. The injection molding device comprises an upper jacking plate, a lower jacking plate, a first mold plate and a second mold plate, an upper mold cover is embedded in the first mold plate, a lower mold cover is embedded in the second mold plate, two lower mold cavities of the lower mold cover are both internally provided with upper central reverse mold gears, injection molding cavities are formed among the corresponding upper mold surface located on the upper moldcover, the upper central reverse mold gears and the inner walls of the lower mold cavities, the tops of two central rods arranged on the lower jacking plate penetrate through the upper jacking plateand the second mold plate to be attached to the semi-spherical concave surface of the upper mold surface, semi-spherical grooves located at the tops of the central rods communicate with the corresponding pouring gates, arc-shaped chutes distributed at the tops of the central rods enable the semi-spherical grooves to communicate with the injection molding cavities, two cutter sleeves of the upper jacking plate sleeve the corresponding central rods respectively, and annular cutting edges located at the tops of the cutter sleeves abut against the opened lower edges of the injection molding cavities. According to the injection molding device for the inner gears with the pouring gates cut in the mold, and the injection molding method, all pouring heads can be cut off at a time while multi-pointpouring is realized, and using is convenient.

Description

technical field [0001] The invention relates to an injection molding device, in particular to an injection molding device and an injection molding method for an internal gear of an in-mold shear gate. Background technique [0002] Injection molding refers to the molding process of injecting heated and melted materials into the mold cavity under high pressure, and after cooling and solidifying, the predetermined injection molded parts are obtained. Usually, after the injection molding process is completed, the injection molded part and the corresponding material head are connected together through the gate, and the workers need to trim the gate on site, which is labor-intensive and the gate trimming is not beautiful. There is also an in-mold cutting mold disclosed in the industry, which can cut off the rubber gate through the thimble before the mold is opened, but the existing structure is only suitable for one gate, and the gate is located on one side of the injection molded...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an injection molding device and injection molding method for the internal gear of the shear gate in the mold, which solves the disadvantages of uneven pouring and slow pouring speed when the existing mold is injected

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